From 0ec28b0d659836a5fb32702cdee8c3433727f48f Mon Sep 17 00:00:00 2001
From: Determinant <ted.sybil@gmail.com>
Date: Thu, 9 May 2019 11:24:04 -0400
Subject: ...

---
 src/hotstuff_app.cpp | 58 +++++++++++++++++++++++++++++++++++++---------------
 1 file changed, 41 insertions(+), 17 deletions(-)

(limited to 'src')

diff --git a/src/hotstuff_app.cpp b/src/hotstuff_app.cpp
index bc596f4..49e06a3 100644
--- a/src/hotstuff_app.cpp
+++ b/src/hotstuff_app.cpp
@@ -78,11 +78,16 @@ class HotStuffApp: public HotStuff {
     /** The listen address for client RPC */
     NetAddr clisten_addr;
 
-//#if HOTSTUFF_CMD_RESPSIZE > 0
     std::unordered_map<const uint256_t, promise_t> unconfirmed;
-//#endif
 
     using conn_t = ClientNetwork<opcode_t>::conn_t;
+    using resp_queue_t = salticidae::MPSCQueueEventDriven<Finality>;
+
+    /* for the dedicated thread sending responses to the clients */
+    EventContext resp_ec;
+    std::thread resp_thread;
+    resp_queue_t resp_queue;
+    salticidae::BoxObj<salticidae::ThreadCall> resp_tcall;
 
     void client_request_cmd_handler(MsgReqCmd &&, const conn_t &);
 
@@ -102,14 +107,7 @@ class HotStuffApp: public HotStuff {
 #ifndef HOTSTUFF_ENABLE_BENCHMARK
         HOTSTUFF_LOG_INFO("replicated %s", std::string(fin).c_str());
 #endif
-//#if HOTSTUFF_CMD_RESPSIZE > 0
-        auto it = unconfirmed.find(fin.cmd_hash);
-        if (it != unconfirmed.end())
-        {
-            it->second.resolve(fin);
-            unconfirmed.erase(it);
-        }
-//#endif
+        resp_queue.enqueue(fin);
     }
 
 //#ifdef HOTSTUFF_AUTOCLI
@@ -142,6 +140,7 @@ class HotStuffApp: public HotStuff {
                 const ClientNetwork<opcode_t>::Config &clinet_config);
 
     void start(const std::vector<std::pair<NetAddr, bytearray_t>> &reps);
+    void stop();
 };
 
 std::pair<std::string, std::string> split_ip_port_cport(const std::string &s) {
@@ -265,7 +264,7 @@ int main(int argc, char **argv) {
         reps.push_back(std::make_pair(
             NetAddr(p.first), hotstuff::from_hex(r.second)));
     }
-    auto shutdown = [&](int) { ec.stop(); };
+    auto shutdown = [&](int) { papp->stop(); };
     salticidae::SigEvent ev_sigint(ec, shutdown);
     salticidae::SigEvent ev_sigterm(ec, shutdown);
     ev_sigint.add(SIGINT);
@@ -295,6 +294,22 @@ HotStuffApp::HotStuffApp(uint32_t blk_size,
     ec(ec),
     cn(ec, clinet_config),
     clisten_addr(clisten_addr) {
+    /* prepare the thread used for sending back confirmations */
+    resp_tcall = new salticidae::ThreadCall(resp_ec);
+    resp_queue.reg_handler(resp_ec, [this](resp_queue_t &q) {
+        Finality fin;
+        while (q.try_dequeue(fin))
+        {
+            auto it = unconfirmed.find(fin.cmd_hash);
+            if (it != unconfirmed.end())
+            {
+                it->second.resolve(fin);
+                unconfirmed.erase(it);
+            }
+        }
+        return false;
+    });
+
     /* register the handlers for msg from clients */
     cn.reg_handler(salticidae::generic_bind(&HotStuffApp::client_request_cmd_handler, this, _1, _2));
     cn.start();
@@ -310,12 +325,13 @@ void HotStuffApp::client_request_cmd_handler(MsgReqCmd &&msg, const conn_t &conn
     // record the data of the command
     storage->add_cmd(cmd);
     if (get_pace_maker().get_proposer() == get_id())
+    {
         exec_command(cmd_hash).then([this, addr](Finality fin) {
-            cn.send_msg(MsgRespCmd(fin), addr);
+            resp_queue.enqueue(fin);
         });
-//#if HOTSTUFF_CMD_RESPSIZE > 0
-    else
-    {
+    }
+    /* the following function is executed on the dedicated thread for confirming commands */
+    resp_tcall->async_call([this, addr, cmd_hash](salticidae::ThreadCall::Handle &) {
         auto it = unconfirmed.find(cmd_hash);
         if (it == unconfirmed.end())
             it = unconfirmed.insert(
@@ -323,8 +339,7 @@ void HotStuffApp::client_request_cmd_handler(MsgReqCmd &&msg, const conn_t &conn
         it->second.then([this, addr](const Finality &fin) {
             cn.send_msg(MsgRespCmd(std::move(fin)), addr);
         });
-    }
-//#endif
+    });
 }
 
 void HotStuffApp::start(const std::vector<std::pair<NetAddr, bytearray_t>> &reps) {
@@ -352,10 +367,19 @@ void HotStuffApp::start(const std::vector<std::pair<NetAddr, bytearray_t>> &reps
         else
             client_conns.erase(conn);
     });
+    resp_thread = std::thread([this]() { resp_ec.dispatch(); });
     /* enter the event main loop */
     ec.dispatch();
 }
 
+void HotStuffApp::stop() {
+    papp->resp_tcall->async_call([this](salticidae::ThreadCall::Handle &) {
+        resp_ec.stop();
+    });
+    resp_thread.join();
+    ec.stop();
+}
+
 void HotStuffApp::print_stat() const {
 #ifdef HOTSTUFF_MSG_STAT
     HOTSTUFF_LOG_INFO("--- client msg. (10s) ---");
-- 
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